package vn.co.thn.android.store.adapter;

import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.content.Context;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.Filter;
import android.widget.Filterable;

public class NSPlacesAutoCompleteAdapter extends ArrayAdapter<String> implements
		Filterable {
	private ArrayList<String> resultList;
	public NSPlacesAutoCompleteAdapter(Context context, int resource) {
		super(context, resource);
		// TODO Auto-generated constructor stub
	}
	 @Override
	    public int getCount() {
	        return resultList.size();
	    }

	    @Override
	    public String getItem(int index) {
	        return resultList.get(index);
	    }

	    @Override
	    public Filter getFilter() {
	        Filter filter = new Filter() {
	            @Override
	            protected FilterResults performFiltering(CharSequence constraint) {
	                FilterResults filterResults = new FilterResults();
	                if (constraint != null) {
	                    // Retrieve the autocomplete results.
	                    resultList = autocomplete(constraint.toString());

	                    // Assign the data to the FilterResults
	                    filterResults.values = resultList;
	                    filterResults.count = resultList.size();
	                }
	                return filterResults;
	            }

	            @Override
	            protected void publishResults(CharSequence constraint, FilterResults results) {
	                if (results != null && results.count > 0) {
	                    notifyDataSetChanged();
	                }
	                else {
	                    notifyDataSetInvalidated();
	                }
	            }};
	        return filter;
	    }
	private static final String LOG_TAG = "ExampleApp";

	private static final String PLACES_API_BASE = "https://maps.googleapis.com/maps/api/place";
	private static final String TYPE_AUTOCOMPLETE = "/autocomplete";
	private static final String OUT_JSON = "/json";

	private static final String API_KEY = "AIzaSyA8v2pSppHOwkSsHk0Ii6MXvmdARiUdnJc";

	private ArrayList<String> autocomplete(String input) {
		ArrayList<String> resultList = null;

		HttpURLConnection conn = null;
		StringBuilder jsonResults = new StringBuilder();
		try {
			StringBuilder sb = new StringBuilder(PLACES_API_BASE
					+ TYPE_AUTOCOMPLETE + OUT_JSON);
			sb.append("?key=" + API_KEY);
			sb.append("&components=country:uk");
			sb.append("&input=" + URLEncoder.encode(input, "utf8"));

			URL url = new URL(sb.toString());
			conn = (HttpURLConnection) url.openConnection();
			InputStreamReader in = new InputStreamReader(conn.getInputStream());

			// Load the results into a StringBuilder
			int read;
			char[] buff = new char[1024];
			while ((read = in.read(buff)) != -1) {
				jsonResults.append(buff, 0, read);
			}
		} catch (MalformedURLException e) {
			Log.e(LOG_TAG, "Error processing Places API URL", e);
			return resultList;
		} catch (IOException e) {
			Log.e(LOG_TAG, "Error connecting to Places API", e);
			return resultList;
		} finally {
			if (conn != null) {
				conn.disconnect();
			}
		}

		try {
			// Create a JSON object hierarchy from the results
			JSONObject jsonObj = new JSONObject(jsonResults.toString());
			JSONArray predsJsonArray = jsonObj.getJSONArray("predictions");

			// Extract the Place descriptions from the results
			resultList = new ArrayList<String>(predsJsonArray.length());
			for (int i = 0; i < predsJsonArray.length(); i++) {
				resultList.add(predsJsonArray.getJSONObject(i).getString(
						"description"));
			}
		} catch (JSONException e) {
			Log.e(LOG_TAG, "Cannot process JSON results", e);
		}

		return resultList;
	}
}
